LD2982BXX18
Very low drop and low noise voltage regulator with
inhibit function, low ESR capacitors compatible
Features
■
Very low dropout voltage (120 mV at 50 mA
and 7 mV at 1 mA load)
■
Very low quiescent current (375 mA typ. at
50 mA load and 75 mA at 1 mA)
■
Output current up to 50 mA
■
Logic controlled electronic shutdown
■
Output voltage of 1.8 V
■
Internal current and thermal limit
■
Available in ± 1 % tolerance
(at 25 °C, A version)
■
Supply voltage rejection: 45 dB (typ)
■
Only 1 µF for stability
■
Low output noise voltage 30 µVrms
■
Smallest package SOT23-5L
■
Temperature range: -40 °C to 125 °C
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Typical application are in cellular phone,
palmtop/laptop computer, personal digital
assistant (PDA), personal stereo, camcorder and
camera.
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Description
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The LD2982 is a 50 mA fixed output voltage
regulator. The ultra low drop voltage and the low
quiescent current make them particularly suitable
for low noise, low power applications, and in
battery powered systems. In sleep mode
quiescent current is less than 1 µA when INHIBIT
pin is pulled low. Shutdown logic control function
is available on pin 3 (TTL compatible). This
means that when the device is used as local
regulator, it is possible to put a part of the board in
standby, decreasing the total power consumption.
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An external capacitor CBYP = 10 nF connected
between bypass pin and GND reduce the noise to
30 µVrms.
Table 1.
July 2009
Device summary
Order code
Output voltage
LD2982BM18R
1.8 V
Doc ID 8188 Rev 7
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www.st.com
17
Contents
LD2982BXX18
Contents
1
Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Application notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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6.1
External capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.2
Input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.3
Output capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.4
Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.5
Inhibit input operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
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7
Package mechanical
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Revision rhistory . . . . . . )
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
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6.6
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Reverse current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Doc ID 8188 Rev 7
LD2982BXX18
Diagram
1
Diagram
Figure 1.
Schematic diagram
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Doc ID 8188 Rev 7
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Pin configuration
LD2982BXX18
2
Pin configuration
Figure 2.
Pin connections (top view)
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Table 2.
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Pin description
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Pin n°
Symbol
1
IN
2
GND
3
INHIBIT
Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating.
Disable the device when connected to GND or to a positive voltage less than 0.18V
4
Bypass
Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise
performances
5
OUT
Table 3.
Symbol
Name and function
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Ground pin
Output port
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Thermal data
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Input port
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Parameter
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SOT23-5L
Unit
RthJC
Thermal resistance junction-case
81
°C/W
RthJA
Thermal resistance junction-ambient
255
°C/W
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Doc ID 8188 Rev 7
LD2982BXX18
Maximum ratings
3
Maximum ratings
Table 4.
Absolute maximum ratings
Symbol
VI
Parameter
VINH
Value
Unit
DC input voltage
16
V
INHIBIT input voltage
16
V
IO
Output current
Internally limited
PD
Power dissipation
Internally limited
TSTG
Storage temperature range
-65 to 150
TOP
Operating junction temperature range
-40 to 125
Note:
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°C
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Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
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Doc ID 8188 Rev 7
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Electrical characteristics
4
LD2982BXX18
Electrical characteristics
TJ = 25 °C, VI = VO + 1 V, IO = 1 mA, VSHDN = 2 V, CI = CO = 1 µF, unless otherwise
specified.
Table 5.
Electrical characteristics for LD2982BXX18
Symbol
VOP
Parameter
Test conditions
Min.
Operating input voltage
2.5
VI = 2.5V
VO
VO
VO
Output voltage
Output voltage
Output voltage
1.477
IO = 1 to 50mA
1.470
IO = 1 to 50mA, TJ= -40 to 125°C
1.447
VI = 2.8V
1.773
IO = 1 to 50mA
1.764
1.737
2.462
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IO = 1 to 50mA
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VI = 3.8V
Output voltage
IO = 1 to 50mA
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IO = 1 to 50mA, TJ= -40 to 125°C
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VI = 3.85V
VO
Output voltage
IO = 1 to 50mA
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VO
Output voltage
VO
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VO
VO
VO
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Output voltage
Output voltage
Output voltage
Output voltage
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IO = 1 to 50mA
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2.5
1.836
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2.537
2.55
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2.8
2.842
2.856
2.85
3.0
2.94
2.895
2.893
V
3.045
3.06
V
3.105
3.1
3.146
IO = 1 to 50mA
3.038
3.162
IO = 1 to 50mA, TJ= -40 to 125°C
2.991
3.208
VI = 4.2V
3.152
IO = 1 to 50mA
3.136
3.264
IO = 1 to 50mA, TJ= -40 to 125°C
3.088
3.312
VI = 4.3V
3.250
3.2
3.3
V
3.349
IO = 1 to 50mA
3.234
3.366
3.184
3.415
VI = 4.5V
3.447
IO = 1 to 50mA
3.430
3.5
V
3.248
IO = 1 to 50mA, TJ= -40 to 125°C
V
3.552
3.370
IO = 1 to 50mA, TJ= -40 to 125°C
3.377
VI = 4.6V
3.546
IO = 1 to 50mA
3.528
3.672
IO = 1 to 50mA, TJ= -40 to 125°C
3.474
3.726
Doc ID 8188 Rev 7
V
2.898
2.907
3.053
V
2.587
2.950
IO = 1 to 50mA, TJ= -40 to 125°C
V
1.863
2.793
2.955
V
1.827
2.750
VI = 4.1V
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Output voltage
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VO
VI = 4.0V
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2.758
2.807
16
1.523
1.8
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Unit
1.530
2.412
2.744
Max.
1.553
2.45
2.702
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IO = 1 to 50mA, TJ= -40 to 125°C
1.5
Pr
IO = 1 to 50mA, TJ= -40 to 125°C
VI = 3.5V
IO = 1 to 50mA, TJ= -40 to 125°C
VO
Typ.
V
3.662
3.6
3.654
V
LD2982BXX18
Table 5.
Electrical characteristics
Electrical characteristics for LD2982BXX18 (continued)
Symbol
VO
Parameter
Test conditions
Output voltage
VO
Output voltage
VO
Output voltage
VO
Output voltage
Min.
Typ.
Max.
VI = 4.8V
3.743
3.8
3.857
IO = 1 to 50mA
3.724
IO = 1 to 50mA, TJ= -40 to 125°C
3.667
VI = 5.0V
3.94
IO = 1 to 50mA
3.92
4.08
IO = 1 to 50mA, TJ= -40 to 125°C
3.86
4.14
VI = 5.7V
4.629
IO = 1 to 50mA
4.606
4.794
IO = 1 to 50mA, TJ= -40 to 125°C
4.535
4.864
VI = 6.0V
4.925
IO = 1 to 50mA
Short circuit current
ΔVO/ΔVI
Line regulation
4.825
VI = VO + 1V to 16V, IO = 1 mA,
TJ= -40 to 125°C
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IO = 0
-O
IO = 1mA
VDROP
Dropout voltage
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OFF MODE
IO = 50mA
0.003
0.014
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120
80
200
IO = 10mA, TJ= -40 to 125°C
600
IO = 50mA, TJ= -40 to 125°C
Output noise voltage
150
300
900
1
45
dB
0.15
2
V
V
VINH = 0V, TJ= -40 to 125°C
5
15
VINH = 5V, TJ= -40 to 125°C
0
-1
B = 300 Hz to 50 kHz, CBYP = 0.01µF,
CO = 10µF
30
Doc ID 8188 Rev 7
µA
0
VINH
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